A magnetic fluid-based cutting fluid constant-temperature purification separation device and separation method

Abstract

The application provides a kind of based on magnetic fluid's cutting fluid constant temperature purification separation device and separation method, device includes front permanent magnet-net filter pretreatment module, double-chamber magnetic fluid constant temperature separation tank, magnetic fluid excitation heating device, temperature detection control module and overflow oil discharge component.The device removes iron filings and suspended particles in cutting fluid by permanent magnetic adsorption and filter screen filtration, achieves oil-water layering by magnetic fluid density gradient, and uses magnetic coil and temperature detection control module to assist heating and temperature compensation of cutting fluid.The application can improve the stability of cutting fluid purification separation and the recycling effect under low temperature conditions.

Description

Technical Field

[0001] This invention relates to a thermostatic purification and separation device for cutting fluid based on magnetofluid, and also to a thermostatic purification and separation method for cutting fluid based on magnetofluid, belonging to the technical field of cutting fluid purification equipment. Background Technology

[0002] In the field of machining, cutting fluid is a key medium to ensure machining accuracy and extend tool life. However, during its use, it can be mixed with iron filings, non-magnetic suspended particles and oil, which can lead to the deterioration of the cutting fluid's performance. Direct discharge would result in resource waste and environmental pollution. Purification treatment is required before recycling.

[0003] To address the aforementioned challenges, existing cutting fluid purification solutions mainly include screen filtration, chemical demulsification, electronic centrifugation, and single magnetohydrodynamic separation. However, all of these solutions have significant drawbacks: screen filtration cannot remove fine iron filings and emulsified oil droplets, and the screen is prone to clogging; chemical demulsification can easily lead to cutting fluid deterioration and secondary pollution; electronic centrifugation equipment is complex and costly, making it unsuitable for small and medium-sized enterprises; and single magnetohydrodynamic separation does not integrate an iron filings filtration module, and fine iron filings can easily disrupt the magnetohydrodynamic density gradient, resulting in unstable separation performance and high operating costs.

[0004] Magnetorheological fluid separation technology offers a new approach to deep purification of cutting fluids due to its advantages of high separation precision and no secondary pollution. Its core principle is to use a magnetic field to create a stable density gradient in the magnetorheological fluid, achieving stratification of substances with different densities. However, the application of this technology in cutting fluid purification still has limitations: existing devices are mostly single-separation structures, failing to achieve synergistic linkage between "chip filtration and magnetorheological fluid separation," and lack a dual-chamber step-by-step purification design, making it difficult to meet the purification effect and efficiency requirements of continuous industrial production; furthermore, the devices are structurally dispersed, inconvenient to maintain, and have poor adaptability.

[0005] Furthermore, the purification and recycling process of cutting fluid is easily affected by liquid temperature. When the ambient temperature is low or the cutting fluid has been circulated for a long time, the viscosity of the cutting fluid increases, the floating speed of oil sludge decreases, and the sedimentation efficiency of suspended particles and oil-water stratification decreases, which can easily lead to increased filtration resistance and unstable separation effect. Most existing cutting fluid purification devices only focus on the filtration, adsorption, or oil-water separation process, lacking the regulation and compensation of liquid temperature during the purification process, making it difficult to ensure that the cutting fluid can stably complete separation and recycling within a suitable temperature range.

[0006] Based on this, the development of a cutting fluid purification device that integrates iron filings adsorption, particle filtration, precise oil-water separation, and temperature compensation functions, and is small in size, highly efficient, and easy to maintain, is a pressing technical problem in this field. It aims to solve the pain points of existing technologies and achieve constant-temperature purification and recycling of cutting fluid. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a permanent magnet-mesh filter cutting fluid constant temperature separation device based on magnetohydrodynamic assisted heating, and more particularly, an integrated cutting fluid purification and recycling device that integrates iron filings adsorption, particle filtration, precise oil-water separation, and temperature compensation functions. This device is used to deeply purify cutting fluid containing iron filings, oil, and suspended particles generated during machining, enabling the recycling and reuse of cutting fluid, thereby saving resources, reducing environmental treatment costs, and contributing to the green development of the manufacturing industry.

[0008] This invention provides a permanent magnet-mesh filter cutting fluid isothermal separation device based on magnetohydrodynamic assisted heating, characterized in that it comprises:

[0009] The pre-treatment module is a permanent magnet-mesh filter, the dual-chamber magnetic fluid constant temperature separation box is a magnetic fluid excitation heating device, the temperature detection and control module is a temperature detection and control module and the overflow oil drainage assembly.

[0010] The pre-treatment module with permanent magnet and mesh filter is used to adsorb iron filings and filter non-magnetic suspended particles.

[0011] The dual-chamber magnetohydrodynamic constant temperature separation chamber is connected to the pre-filter permanent magnet-mesh filter pretreatment module via a pipeline, which is used to purify the cutting fluid in steps, direct its flow, and trap non-magnetic small particulate impurities.

[0012] The magnetohydrodynamic excitation heating device is installed on both sides of the dual-chamber magnetohydrodynamic constant temperature separation box. It is used to form a stable density gradient in the magnetohydrodynamic constant temperature separation box and to provide auxiliary heating and temperature compensation for the cutting fluid in the box.

[0013] The temperature detection and control module is used to detect the liquid temperature in the dual-chamber magnetic fluid thermostatic separation chamber and adjust the power supply status of the magnetic fluid excitation heating device according to the set temperature.

[0014] The overflow drain assembly is located on the upper layer of the dual-chamber magnetic fluid constant temperature separator and is used to drain the floating oil after separation.

[0015] Furthermore, the cutting fluid constant temperature purification and separation device based on magnetofluid of the present invention also has the following features: a permanent magnet is provided at the center of the pre-positioned permanent magnet-mesh filter pretreatment module, a pull-out filter screen is sleeved on the outside of the permanent magnet, and a funnel-shaped flow guiding structure is integrally formed at the bottom of the pre-positioned permanent magnet-mesh filter pretreatment module.

[0016] Furthermore, the cutting fluid constant temperature purification and separation device based on magnetic fluid of the present invention also has the following features: a dual-chamber magnetic fluid constant temperature separation box, the box body is provided with a detachable vertical partition, the partition divides the box body into an inlet chamber and an outlet chamber, and an opening-type gap is opened at a predetermined position at the bottom of the partition, and a detachable filter screen for intercepting non-magnetic small particulate impurities is embedded in the opening-type gap.

[0017] Furthermore, the cutting fluid constant temperature purification and separation device based on magnetofluid of the present invention also has the following features: a water inlet is provided through the upper layer of the water inlet chamber, and the water inlet is connected to the bottom of the pre-filter permanent magnet-mesh filter pretreatment module through a pipe.

[0018] Furthermore, the cutting fluid constant-temperature purification and separation device based on magnetofluid of the present invention also has the following feature: the magnetofluid excitation heating device includes a magnetic coil, a high-precision linear slide rail, a drive assembly, and an integrated magnetic and temperature control module.

[0019] The linear slide rails are symmetrically fixed to the outer wall of the dual-chamber magnetic fluid constant temperature separation chamber, and the magnetic coils are installed on the sliders of the linear slide rails.

[0020] When the magnetic coil is energized, it generates a magnetic field that acts on the magnetic fluid, causing the magnetic fluid to form a stable density gradient. At the same time, the cutting fluid in the dual-chamber magnetic fluid constant temperature separation chamber is heated by the Joule heating of the coil and the magnetocaloric effect of the magnetic fluid.

[0021] The temperature detection and control module includes a temperature sensor, which is installed in the inlet chamber, outlet chamber, or outer wall of the dual-chamber magnetohydrodynamic thermostatic separator to collect the temperature of the cutting fluid.

[0022] The integrated magnetic control and temperature control module receives temperature signals from the temperature detection and control module and adjusts the current, frequency, or duty cycle of the magnetic coil to regulate the temperature of the cutting fluid in the separation chamber.

[0023] Furthermore, the cutting fluid constant temperature purification and separation device based on magnetic fluid of the present invention also has the following features: the driving component includes a driving motor and a synchronous belt transmission mechanism, the magnetic coils on both sides are connected by a guide rod made of non-magnetic material, the driving motor drives the guide rod through the synchronous belt transmission mechanism, and drives the magnetic coil to perform synchronous reciprocating motion along the linear slide rail.

[0024] Furthermore, the cutting fluid constant temperature purification and separation device based on magnetofluid of the present invention also has the following features: the overflow oil discharge assembly includes an overflow pipe and an overflow oil discharge control valve, the overflow pipe is fixed to the upper part of the water inlet chamber, and the overflow oil discharge control valve is mounted on the overflow pipe.

[0025] Furthermore, the cutting fluid constant temperature purification and separation device based on magnetic fluid of the present invention also has the following features: a detachable cover plate is provided on the side of the dual-chamber magnetic fluid constant temperature separation box, and a sealing element is provided between the detachable cover plate and the box body of the dual-chamber magnetic fluid constant temperature separation box, and the cover plate is sealed and fixedly connected to the box body by fasteners.

[0026] Furthermore, the cutting fluid constant-temperature purification and separation device based on magnetofluid of the present invention also has the following feature: an elongated groove is formed on the outer wall of the dual-chamber magnetofluid constant-temperature separation chamber corresponding to the reciprocating motion area of ​​the magnetic coil, and a magnetic plate for guiding and concentrating the magnetic field is sealed and embedded in the groove.

[0027] The magnetic coil is mounted on a non-magnetic support frame. The frame is rigidly connected to the magnetic coil housing by fasteners, and the force direction of the fasteners is consistent with the reciprocating motion direction of the magnetic coil.

[0028] The present invention also provides a method for isothermal separation of cutting fluid based on magnetofluid, and a method for isothermal purification and separation of cutting fluid based on magnetofluid provided in any one of the above-mentioned methods, characterized in that it includes the following steps:

[0029] Step 1: The cylindrical mesh permanent magnet in the center of the pre-treatment module adsorbs iron filings and impurities in the cutting fluid, while the pull-out stainless steel filter screen intercepts non-magnetic suspended particles, completing the initial purification.

[0030] Step Two: The drive motor drives the connecting rod, which is connected to it via a synchronous belt transmission mechanism, to move the magnetic coil support frame. This causes the magnetic coil support frame to move the magnetic coil back and forth on a high-precision linear slide rail. At the same time, the magnetic coil is energized to generate a magnetic field, which, after being guided by the magnetic plate, creates a stable density gradient in the magnetic fluid inside the main body of the dual-chamber magnetic fluid constant temperature separation chamber.

[0031] The pretreated cutting fluid flows into the inlet chamber of the dual-chamber magnetic fluid thermostatic separator through the inlet. Under the action of the magnetic fluid density gradient, substances of different densities are separated into layers.

[0032] Step 3: Open the overflow oil control valve to discharge and collect the oil floating on the top through the overflow pipe; open the cutting fluid outlet circulation control valve so that the cutting fluid in the middle layer flows into the water outlet chamber in one direction through the gap filter screen at a predetermined height position at the bottom of the vertical partition, and then flows back to the machining station for reuse.

[0033] During steps two and three, the temperature detection and control module collects temperature signals in real time from the inside or the outer wall of the dual-chamber magnetohydrodynamic thermostatic separation chamber.

[0034] When the detected temperature is lower than the set range, the controller increases the current, frequency or duty cycle of the magnetic coil to provide auxiliary heating while maintaining the magnetic field.

[0035] When the detected temperature reaches the set range, the controller reduces the working intensity of the magnetic coil or maintains intermittent energization, so that the cutting fluid can complete oil-water separation, particle sedimentation and recycling under relatively stable temperature conditions.

[0036] The function and effects of this invention:

[0037] The permanent magnet-mesh filter constant-temperature separation device for cutting fluid based on magnetohydrodynamic (MHD) assisted heating provided by this invention has high processing efficiency. This technology can process cutting fluid containing impurities and oil generated during machining quickly and with a large processing capacity. It has a strong separation capability for fine iron filings, suspended particles, and trace amounts of floating oil that are difficult to remove by other separation methods, achieving deep purification of the cutting fluid. Simultaneously, this device uses a MHD excitation heating device and a temperature detection and control module to provide auxiliary heating and temperature compensation for the cutting fluid. This reduces the adverse effects of increased cutting fluid viscosity under low temperature or temperature fluctuation conditions on oil-water stratification, particle sedimentation, and the stability of recycling, thus improving the stability of the cutting fluid purification and separation process.

[0038] The permanent magnet-mesh filter cutting fluid constant temperature separation device based on magnetohydrodynamic assisted heating provided by this invention is small in size, simple in structure, and highly integrated. It integrates pretreatment, oil-water separation, and oil drainage functions into one unit, occupying little space and facilitating maintenance. Since separation is achieved by magnetic field control, no complex power components are required, resulting in lower operating costs and further saving on usage costs. No chemical reagents are added throughout the process; purification is achieved through physical adsorption, mechanical filtration, and magnetic field separation, avoiding cutting fluid deterioration and secondary pollution. It is suitable for the actual needs of small and medium-sized machining enterprises. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the magnetic fluid isothermal separation device of the present invention.

[0040] Figure 2 for Figure 1 Schematic diagram of the middle box

[0041] Figure 3 for Figure 2 Cross-sectional view of the internal structure of the middle box.

[0042] Figure 4 for Figure 1 A schematic diagram of the top linear guide transmission mechanism.

[0043] Figure 5 for Figure 1 A cross-sectional view of the filter device.

[0044] Figure 6 for Figure 1 A schematic diagram of the internal structure of the medium-conductivity magnetic coil.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Cutting fluid outlet control valve; 2. Screws; 3. Main body of the dual-chamber magnetic fluid constant temperature separator; 3-1. Water outlet chamber; 3-2. Vertical partition; 3-3. Filter screen; 3-4. Water inlet chamber; 4. Drive motor; 5. Synchronous belt drive mechanism; 5-1. Synchronous belt; 5-2. Synchronous pulley; 6. Connecting rod; 7. Slider connecting seat; 7-1. Bottom slider; 7-2. Anti-collision pad; 7-3. Clamping block; 8. Synchronous belt; 9. Driven synchronous pulley; 10. Removable cover plate; 11. Q235 12. Low-carbon steel magnetic guide plate; 13. Slide rail clearance adjustment support plate; 14. Overflow oil discharge control valve; 15. High-precision linear slide rail; 16. Magnetic coil support frame; 17. First internal hexagonal head screw; 18. Magnetic coil housing; 19. Top fastening screw; 20. Connecting rod; 21. Second internal hexagonal head screw; 22. Third internal hexagonal head screw; 23. Water inlet pipe; 24. Support column for pre-filter pretreatment module; 25. Pre-filter pretreatment module carrier platform; 26. Cylindrical mesh permanent magnet; 27. Pull-out filter barrel; 28. Outer filter unit; 27-1. Side filter; 27-2. Bottom filter; 29. ​​Bottom funnel; 30. Magnetic guide plate; 31. Magnetic coil; 32. Power cord; 33. Coil frame; 44. Magnetic guide frame housing. Detailed Implementation

[0047] To make the technical solution and advantages of the present invention clearer, the specific operation process of the present invention will be described in detail below with reference to the accompanying drawings and the working process of the device.

[0048] like Figures 1 to 6 As shown, the dual-chamber permanent magnet-mesh filter cutting fluid constant temperature separation device based on magnetic fluid assisted heating provided in this embodiment includes: a pre-treatment module for permanent magnet-mesh filter, a dual-chamber magnetic fluid constant temperature separation chamber, a magnetic fluid excitation heating device, and an overflow oil drainage assembly.

[0049] like Figure 1 As shown, the pre-treatment module for permanent magnet-mesh filter includes: a support column 23, a bearing platform 24, a cylindrical mesh permanent magnet 25, a pull-out filter barrel 26, and a stainless steel filter barrel filter surface 27.

[0050] like Figure 1 and Figure 2 As shown, the dual-chamber magnetic fluid thermostatic separator includes: a cutting fluid outlet control valve 1, screws 2, the main body of the dual-chamber magnetic fluid thermostatic separator 3, a detachable cover plate 10, a Q235 low carbon steel magnetic plate 11, an overflow oil discharge control valve 13, and a water inlet pipe 22.

[0051] The magnetohydrodynamic excitation heating device includes: a drive motor 4, a synchronous belt transmission mechanism 5, a connecting rod 6, a slider connecting seat 7, a synchronous belt 8, a driven synchronous pulley 9, a slide rail clearance adjustment support plate 12, a high-precision linear slide rail 14, a magnetic coil support frame 15, a first internal hexagonal head screw 16, a magnetic coil housing 17, a top fastening screw 18, a connecting rod 19, a second internal hexagonal head screw 20, and a third internal hexagonal head screw 21.

[0052] The overflow drain assembly includes an overflow drain control valve 13 and a matching drain pipe.

[0053] The pre-filter permanent magnet pretreatment module is used to pre-treat cutting fluid containing impurities and oil, achieving the adsorption of iron filings and the interception of large non-magnetic particles.

[0054] The dual-chamber magnetohydrodynamic constant temperature separator is used to achieve oil-water separation and non-magnetic small particle interception of cutting fluid, providing space for the circulation and storage of purified cutting fluid.

[0055] The magnetic fluid excitation heating device acts on the dual-chamber magnetic fluid constant temperature separation box, so that the magnetic fluid in the box forms a stable vertical density gradient, which helps to achieve oil-water separation and small particles settling to the bottom.

[0056] The overflow drain assembly is used to directionally drain the separated floating oil, thus separating the floating oil from the cutting fluid.

[0057] Specifically:

[0058] The pre-treatment module with permanent magnet and mesh filter is a cylindrical integrated structure with a funnel-shaped bottom. The pre-treated cutting fluid is collected through the funnel 29 and then connected to the water inlet pipe 22.

[0059] The pre-processing module with permanent magnet and mesh filter is vertically supported by the support column 23. The bottom of the support column 23 is rigidly connected to the equipment frame, and the top is fixedly connected to the bearing platform 24. The pre-processing core unit is supported on the bearing platform 24.

[0060] The pretreatment core unit adopts a dual-layer structure of inner adsorption and outer filtration. It includes: an inner adsorption unit, which is a cylindrical mesh permanent magnet 25 made of neodymium iron boron material, capable of generating a stable magnetic field; and an outer filtration unit, which is a pull-out filter barrel 26 with a filter screen surface 27, including a side filter screen 27-1 and a bottom filter screen 27-2, which is its core filtration component with a pore size of 50μm.

[0061] The pull-out filter bucket 26 is fitted onto the outside of the cylindrical mesh permanent magnet 25. It is made of stainless steel and can be pulled upwards to be removed.

[0062] The core component of the dual-chamber magnetic fluid constant temperature separation chamber is the main chamber 3, which is a square chamber made of stainless steel.

[0063] like Figure 3 As shown, the main body 3 has a detachable vertical partition 3-2 inside, which is made of stainless steel plate, dividing the body into an inlet chamber 3-1 and an outlet chamber 3-4.

[0064] The bottom of the vertical partition 3-2 has an opening-type gap, which is located slightly above the bottom of the water inlet chamber. A 20μm pore size stainless steel filter screen 3-3 is embedded in the gap, allowing the purified cutting fluid to flow unidirectionally from the water inlet chamber to the water outlet chamber.

[0065] One end of the water inlet pipe 22 is sealed to the bottom of the pre-filter permanent magnet-mesh pretreatment module, and the other end is connected to the upper layer of the water inlet chamber 3-4 of the main body 3; the bottom of the water outlet chamber 3-1 is provided with a cutting fluid return port for connecting to the machine tool cutting fluid circulation system.

[0066] The outer wall of the main body housing 3, corresponding to the reciprocating motion area of ​​the magnetic coil housing 17, has an elongated groove, such as... Figure 2 As shown, a Q235 low-carbon steel magnetic plate 11 is embedded in the groove. The thickness of the Q235 low-carbon steel magnetic plate 11 is the same as the depth of the groove. After being embedded, it is flush with the outer wall of the main body box 3, and the connection surface is sealed by argon arc welding.

[0067] The main body 3 has a detachable cover plate 10 on its side, both of which are made of stainless steel. A rubber seal is installed between the cover plate and the main body 3, and they are fixedly connected by stainless steel hexagonal bolts 2.

[0068] like Figure 1 As shown, the upper part of the water inlet chamber of the main body 3 is provided with an overflow oil discharge control valve 13, which serves as the core control component of the overflow oil discharge assembly.

[0069] The magnetohydrodynamic excitation heating device includes a power and transmission unit, a slide rail and support adjustment unit, a motion transmission unit, a fixing and protection unit, and an integrated magnetic control and temperature control module.

[0070] like Figure 4 As shown, the power and transmission unit includes: a drive motor 4, a synchronous belt transmission mechanism 5, including a synchronous belt 5-1, a synchronous pulley 5-2, a drive guide rod 6, a slider connecting seat 7, including a bottom slider 7-1, a crash pad 7-2, a clamping block 7-3, a synchronous belt 8, and a driven synchronous pulley 9.

[0071] The bottom slider 7-1 is slidably disposed within the housing of the power and transmission unit, and the anti-collision pad 7-2 is fixed to the side of the bottom slider 7-1. The clamping block 7-3 is disposed in the middle of the slider and is used to clamp the synchronous belt 8, thereby fixing the slider connecting seat 7 to the synchronous belt 8.

[0072] The synchronous belt 8 is connected to the output shaft of the drive motor 4 via the synchronous belt transmission mechanism 5, and meshes with the driven synchronous pulley 9 to form a transmission pair. The slider connecting seat 7 provides guiding support for the reciprocating motion of the mechanism, and the clamping block 7-3 is fixedly connected to the synchronous belt 8 by screws. At the same time, the slider connecting seat 7 is fixedly connected to the drive guide rod 6, which converts the rotational motion output by the drive motor 4 into the linear reciprocating motion of the slider connecting seat 7 along the linear guide rail via the synchronous belt transmission, thereby driving the drive guide rod 6 to perform synchronous linear motion.

[0073] The slide rail and support adjustment unit includes a slide rail clearance adjustment support plate 12, a high-precision linear slide rail 14, a second internal hexagonal head screw 20, and a third internal hexagonal head screw 21.

[0074] The second socket head cap screw 20 is used to fix the slide rail clearance adjustment support plate 12 and rigidly fix it to the equipment frame; the stainless steel third socket head cap screw 21 is used to fix the gap between the high-precision linear slide rail 14 and the slide rail clearance adjustment support plate 12, and the gap size can be finely adjusted.

[0075] The motion transmission unit includes a first link 6, a slider connecting seat 7, a slider on a high-precision linear slide rail 14, a magnetic coil support frame 15, and a second link 19.

[0076] One end of the second connecting rod 19 is fixedly connected to the support frame 15, and the other end is fixedly connected to the slider connecting seat 7. The first connecting rod 6 and the second connecting rod 19 are arranged symmetrically.

[0077] The slider connecting seat 7 is used to connect the first connecting rod 6 and the second connecting rod 19, and is simultaneously fixed to the magnetic coil support frame 15 to achieve synchronous motion transmission. The slider of the high-precision linear slide rail 14 is connected to the magnetic coil support frame 15 by screws.

[0078] The second link 19 is connected to the top of the support frame 15 of the magnetic coils on both sides by fastening screws 18, which enhances the overall rigidity of the frame.

[0079] The magnetic coil support frame 15 is made of non-magnetic material, and a hollow window is opened on the back to match the effective magnetic field area of ​​the magnetic coil housing 17.

[0080] The fixed protective unit includes a first internal hexagonal head screw 16, a magnetic coil housing 17, and a top fastening screw 18.

[0081] The first internal hex socket head cap screw 16 fixes the magnetic coil housing 17 to the magnetic coil support frame 15 from the side, and the direction of force is consistent with the direction of movement of the magnetic coil housing 17.

[0082] The top fastening screw 18 engages with the first internal hexagonal head screws 16 on both sides to fix the second connecting rod 19 to the magnetic coil housing 17 from the top of the magnetic coil support frame 15.

[0083] The integrated magnetic control and temperature control module is electrically connected to the magnetic coil inside the magnetic coil housing 17 via an oil-resistant insulated power cord. The magnetic field strength and auxiliary heating intensity in the separation zone can be precisely controlled by adjusting the coil current, frequency, or duty cycle.

[0084] The integrated magnetic temperature control module receives control commands from the temperature detection and control module to compensate for the temperature of the cutting fluid. The main body of the integrated magnetic temperature control module is fixed to the support base of this device.

[0085] The overflow drain assembly includes an overflow drain control valve 13 and a matching drain pipe.

[0086] The height of the overflow drain control valve 13 corresponds to the position of the floating oil layer after the magnetohydrodynamic stratification. One end of the matching drain pipe is sealed to the outlet of the overflow drain control valve 13, and the other end is connected to the waste oil collection container.

[0087] The magnetic field induction device 17 includes: a magnetic coil 30, a coil frame 32, a magnetic partition 29, a magnetic frame 33, and a power line 31.

[0088] like Figure 6 As shown, the housing 17 of the magnetic field induction device includes a magnetically conductive frame 33 and a magnetically conductive partition 29. The magnetically conductive partition 29 is installed on one side of the housing 3; the coil frame 32 is installed in the middle of the magnetically conductive frame 33, and a magnetically conductive coil 30 is wound on it.

[0089] The permanent magnet-mesh filter cutting fluid isothermal separation device based on magnetohydrodynamic (MHD) assisted heating provided in this embodiment integrates pre-treatment with a permanent magnet-mesh filter composite, MHD density gradient oil-water separation, directional overflow oil discharge, and cutting fluid circulation technology. It performs graded deep purification treatment on waste cutting fluid containing magnetic iron filings, non-magnetic suspended particles, and oil from machining. It efficiently achieves iron filings adsorption, particle filtration, and precise oil-water separation, completing the recovery and reuse of pure cutting fluid. This can improve the reuse rate of cutting fluid, reduce the cost of production consumables and environmental treatment of industrial waste liquid, reduce pollutant emissions, and contribute to green and low-carbon production in the manufacturing industry.

[0090] The working principle of the permanent magnet-mesh filter cutting fluid isothermal separation device based on magnetohydrodynamic assisted heating is as follows:

[0091] Magnetic fluid is pre-placed in the dual-chamber magnetic fluid constant temperature separation chamber. The waste cutting fluid to be treated first enters the pre-treatment module of permanent magnet-mesh filter. The central neodymium iron boron permanent magnet adsorbs magnetic iron chips, and the pull-out non-magnetic stainless steel filter screen intercepts non-magnetic large suspended particles, thus completing the initial purification of the cutting fluid.

[0092] The pretreated cutting fluid flows into the inlet chamber of the dual-chamber magnetofluid thermostatic separator through the inlet. After the magnetic coil of the magnetofluid excitation heating device is energized, a magnetic field is generated. The low-carbon steel magnetic plate on the outside of the chamber achieves efficient guidance and concentration of the magnetic field, so that the magnetofluid inside the chamber forms a stable density gradient.

[0093] Meanwhile, the drive motor drives the magnetic coil support frame to reciprocate synchronously along the high-precision linear slide rail via a synchronous belt transmission mechanism, which enhances the contact and mixing of the cutting fluid and the magnetic fluid and improves the stratification efficiency.

[0094] Because of the significant differences in density between oil, cutting fluid, and solid impurities, oil, being the least dense, floats at the top of the inlet chamber, while non-magnetic fine impurities, being the most dense, are deposited at the bottom of the inlet chamber. Pure cutting fluid is in the middle layer and flows unidirectionally into the outlet chamber through the gap slightly above the bottom of the inlet chamber.

[0095] Finally, the oil floating on top is controlled and collected through the overflow control valve of the overflow drain assembly. Deposited solid impurities can be periodically cleaned through the removable cover and removable vertical partition. The cutting fluid in the outlet chamber is discharged through the cutting fluid circulation control valve and returned to the machining station for reuse, achieving graded deep purification and recycling of the cutting fluid. The specific workflow is as follows:

[0096] Turn on the power of the permanent magnet-mesh filter cutting fluid constant temperature separation device based on magnetic fluid assisted heating, drive the motor 4 to run, drive the connecting rod 6 connected to it through the synchronous belt transmission mechanism 5, drive the magnetic coil support frame 15 connected to it, so that the magnetic coil support frame 15 drives the magnetic coil 17 to move back and forth on the high-precision linear slide rail 14. At the same time, the magnetic coil 17 is energized to generate a magnetic field, which is guided by the magnetic plate 11 to form a stable density gradient of magnetic fluid in the main body 3 of the dual-chamber magnetic fluid constant temperature separation box.

[0097] During the above process, the temperature detection and control module collects the temperature signal inside or on the outer wall of the dual-chamber magnetofluid constant temperature separation chamber in real time. When the detected temperature is lower than the set range, the integrated magnetic control and temperature control module increases the current, frequency, or duty cycle of the magnetic coil, so that the magnetic coil generates an auxiliary heating effect while maintaining the magnetic field. The heat is transferred to the cutting fluid through the magnetic plate and the chamber. The magnetocaloric effect generated by the magnetofluid under the action of the alternating magnetic field compensates for the temperature of the cutting fluid. When the detected temperature reaches the set range, the controller reduces the working intensity of the magnetic coil or maintains an intermittent energization state, so that the cutting fluid can complete oil-water separation, particle sedimentation, and recycling under relatively stable temperature conditions.

[0098] Meanwhile, after passing through the pre-treatment module of permanent magnet-mesh filter, the cylindrical mesh permanent magnet 25 adsorbs iron filings and impurities in the cutting fluid, and the pull-out stainless steel filter screen 26 intercepts large and small non-magnetic suspended particles, completing the initial purification. The pre-treated cutting fluid flows into the inlet chamber of the dual-chamber magnetic fluid constant temperature separation tank through the inlet. Under the action of the magnetic fluid density gradient, substances of different densities achieve stratification: oil stains, due to their lowest density, float at the top of the inlet chamber, non-magnetic solid impurities, due to their highest density, settle at the bottom of the inlet chamber, and pure cutting fluid is in the middle layer, flowing unidirectionally into the outlet chamber through the gap filter 3-3 at the bottom of the vertical partition 3-2.

[0099] At this time, by controlling the overflow oil control valve 13, the oil floating on the top is discharged and collected through the overflow pipe; by controlling the cutting fluid outlet circulation control valve 1, the pure cutting fluid in the water outlet chamber is exported through the pipeline and returned to the machining station for reuse; the non-magnetic solid impurities and iron filings deposited at the bottom of the water inlet chamber can be cleaned periodically by removing the removable cover plate 10 and disassembling the vertical partition 3-2, thus completing a complete cutting fluid purification cycle.

Claims

1. A constant-temperature purification and separation device for cutting fluid based on magnetohydrodynamics, characterized in that, include: The pre-treatment module is a permanent magnet-mesh filter, the dual-chamber magnetic fluid constant temperature separation box is a magnetic fluid excitation heating device, the temperature detection and control module is a temperature detection and control module and the overflow oil drainage assembly. The pre-treatment module for permanent magnet-mesh filter is used to adsorb iron filings and filter non-magnetic suspended particles. The dual-chamber magnetofluid constant temperature separation box is connected to the pre-permanent magnet-mesh filter pretreatment module via a pipeline, which is used to purify the cutting fluid in steps, direct its flow, and intercept non-magnetic small particulate impurities. The magnetic fluid excitation heating device is installed on both sides of the dual-chamber magnetic fluid constant temperature separation box, and is used to form a stable density gradient in the magnetic fluid in the dual-chamber magnetic fluid constant temperature separation box, and to provide auxiliary heating and temperature compensation for the cutting fluid in the box. The temperature detection and control module is used to detect the liquid temperature in the dual-chamber magnetic fluid constant temperature separation box and adjust the power supply status of the magnetic fluid excitation heating device according to the set temperature. The overflow oil discharge assembly is located on the upper layer of the dual-chamber magnetic fluid constant temperature separation box and is used to discharge the separated floating oil.

2. The constant-temperature purification and separation device for cutting fluid based on magnetohydrodynamics according to claim 1, characterized in that: The pre-treatment module with permanent magnet and mesh filter has a permanent magnet at its center, and a pull-out filter barrel is fitted on the outside of the permanent magnet. The bottom of the pre-treatment module with permanent magnet and mesh filter has an integrally formed funnel-shaped flow guide structure.

3. The constant-temperature purification and separation device for cutting fluid based on magnetohydrodynamics according to claim 1, characterized in that: The dual-chamber magnetic fluid constant temperature separation chamber has a detachable vertical partition inside the chamber, which divides the chamber into an inlet chamber and an outlet chamber. A hole-type gap is opened at a predetermined position at the bottom of the partition, and a detachable filter screen for intercepting non-magnetic small particulate impurities is embedded in the hole-type gap.

4. The constant-temperature purification and separation device for cutting fluid based on magnetofluid as described in claim 3, characterized in that: The upper layer of the water inlet chamber is provided with a water inlet, which is connected to the bottom of the pre-filter permanent magnet-mesh filter pretreatment module through a pipe.

5. The constant-temperature purification and separation device for cutting fluid based on magnetohydrodynamics according to claim 1, characterized in that: The magnetohydrodynamic excitation heating device includes a magnetic coil, a high-precision linear slide rail, a drive assembly, and an integrated magnetic and temperature control module. The linear slide rails are symmetrically fixed to the outer wall of the dual-chamber magnetic fluid constant temperature separation chamber, and the magnetic coils are installed on the sliders of the linear slide rails. When the magnetic coil is energized, it generates a magnetic field that acts on the magnetic fluid, causing the magnetic fluid to form a stable density gradient. At the same time, the cutting fluid in the dual-chamber magnetic fluid constant temperature separation box is heated by the Joule heating of the coil and the magnetocaloric effect of the magnetic fluid. The temperature detection and control module includes a temperature sensor, which is installed in the inlet chamber, outlet chamber, or outer wall of the dual-chamber magnetohydrodynamic thermostatic separator to collect the temperature of the cutting fluid. The integrated magnetic control and temperature control module receives temperature signals from the temperature detection and control module and adjusts the current, frequency, or duty cycle of the magnetic coil to compensate for the temperature of the cutting fluid in the separation box.

6. The constant-temperature purification and separation device for cutting fluid based on magnetohydrodynamics according to claim 5, characterized in that: The drive assembly includes a drive motor and a synchronous belt transmission mechanism. The magnetic coils on both sides are connected by a guide rod made of non-magnetic material. The drive motor drives the guide rod through the synchronous belt transmission mechanism, causing the magnetic coils to reciprocate synchronously along the linear slide rail.

7. The constant-temperature purification and separation device for cutting fluid based on magnetohydrodynamics according to claim 1, characterized in that: The overflow drain assembly includes an overflow pipe and an overflow drain control valve. The overflow pipe is fixed to the upper part of the water inlet chamber, and the overflow drain control valve is mounted on the overflow pipe.

8. The constant-temperature purification and separation device for cutting fluid based on magnetohydrodynamics according to claim 3, characterized in that: The dual-chamber magnetic fluid constant temperature separation chamber is provided with a detachable cover plate on its side. A sealing element is provided between the detachable cover plate and the connection surface of the dual-chamber magnetic fluid constant temperature separation chamber. The cover plate is sealed and fixedly connected to the chamber by fasteners.

9. The constant-temperature purification and separation device for cutting fluid based on magnetohydrodynamics according to claim 1, characterized in that: The outer wall of the dual-chamber magnetohydrodynamic constant temperature separation chamber has an elongated groove corresponding to the reciprocating motion area of ​​the magnetic coil. A magnetic plate for guiding and concentrating the magnetic field is sealed and embedded in the groove. The magnetic coil is mounted on a non-magnetic support frame. The frame is rigidly connected to the magnetic coil housing by fasteners, and the force direction of the fasteners is consistent with the reciprocating motion direction of the magnetic coil.

10. A method for isothermal separation of cutting fluid based on magnetofluid, comprising the isothermal purification and separation device for cutting fluid based on magnetofluid as described in any one of the preceding claims, characterized in that, Includes the following steps: Step 1: The cylindrical mesh permanent magnet in the center of the pre-treatment module adsorbs iron filings and impurities in the cutting fluid, while the pull-out stainless steel filter screen intercepts non-magnetic suspended particles, completing the initial purification. Step Two: The drive motor drives the connecting rod, which is connected to it via a synchronous belt transmission mechanism, to move the magnetic coil support frame. This causes the magnetic coil support frame to move the magnetic coil back and forth on a high-precision linear slide rail. At the same time, the magnetic coil is energized to generate a magnetic field, which, after being guided by the magnetic plate, creates a stable density gradient in the magnetic fluid inside the main body of the dual-chamber magnetic fluid constant temperature separation chamber. The pretreated cutting fluid flows into the inlet chamber of the dual-chamber magnetic fluid thermostatic separator through the inlet. Under the action of the magnetic fluid density gradient, substances of different densities are separated into layers. Step 3: Open the overflow drain control valve to drain and collect the oil floating on top through the overflow pipe; Open the cutting fluid outlet circulation control valve, and the cutting fluid in the middle layer flows unidirectionally into the outlet chamber through the gap filter screen at a predetermined height position at the bottom of the vertical partition, and then flows back to the machining station for reuse; During steps two and three, the temperature detection and control module collects temperature signals in real time from the inside or the outer wall of the dual-chamber magnetohydrodynamic thermostatic separation chamber. When the detected temperature is lower than the set range, the controller increases the current, frequency or duty cycle of the magnetic coil to provide auxiliary heating while maintaining the magnetic field. When the detected temperature reaches the set range, the controller reduces the working intensity of the magnetic coil or maintains intermittent energization, so that the cutting fluid can complete oil-water separation, particle sedimentation and recycling under relatively stable temperature conditions.

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